[Code Review] js 回调 golang 的方法

[PIGfaces]

问题描述

在阅读源码感叹大佬的强大时，修炼尚浅的我无法明白注入页面的 addLink 使用异步函数方法重写的原因。大佬可否解答一下。
为何最后要再通过 DeliverResult 方法来触发，这里有点绕

crawlergo/pkg/js/javascript.go

Lines 253 to 265 in 9d6f751

	window["addLink"] = async(...args) => {
	const me = window["addLink"];
	let callbacks = me['callbacks'];
	if (!callbacks) {
	callbacks = new Map();
	me['callbacks'] = callbacks;
	}
	const seq = (me['lastSeq'] || 0) + 1;
	me['lastSeq'] = seq;
	const promise = new Promise(fulfill => callbacks.set(seq, fulfill));
	binding(JSON.stringify({name: "addLink", seq, args}));
	return promise;
	};